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Schulte, Sonja; Bard, Édouard (2003): Cholesterol and C30 of sediment profile MD90-963. PANGAEA, https://doi.org/10.1594/PANGAEA.55877, Supplement to: Schulte, S; Bard, É (2003): Past changes in biologically mediated dissolution of calcite above the chemical lysocline recorded in Indian Ocean sediments. Quaternary Science Reviews, 22(15-17), 1757-1770, https://doi.org/10.1016/S0277-3791(03)00172-0

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Abstract:
In a deep-sea sediment core recovered from a site lying well above the local lysocline, several organic geochemical proxies, and two different calcite dissolution indicators, are compared in order to evaluate the relationship between calcite dissolution and paleoproductivity over the past three glacial-interglacial cycles. The degree of foraminiferal break-up, and the CaCO3 particle size distribution, both point to significant periods of dissolution every 22 kyr during glacial stages and substages. These dissolution events are concomitant with periods of enhanced primary productivity, as indicated by the abundance of several biomarkers (alkenones, cholesterol, brassicasterol, keto-ol), used here to indicate changes in paleoproductivity. Dissolution fluctuations are highly coherent and in phase with the estimated paleoproductivity variations providing strong evidence that the observed dissolution is due to organic matter remineralization within the sediments rather, than to changes in CO32? concentration in the overlying water column.
Project(s):
South Atlantic in Late Quaternary: Reconstruction of Budget and Currents (SFB261)
Coverage:
Latitude: 5.040000 * Longitude: 73.530000
Date/Time Start: 1990-09-12T00:00:00 * Date/Time End: 1990-09-12T00:00:00
Minimum DEPTH, sediment/rock: 0.080 m * Maximum DEPTH, sediment/rock: 16.910 m
Event(s):
MD90-963 (GS900963) * Latitude: 5.040000 * Longitude: 73.530000 * Date/Time: 1990-09-12T00:00:00 * Elevation: -2446.0 m * Recovery: 53.6 m * Campaign: MD65 (SEYMAMA/SHIVA) * Basis: Marion Dufresne * Device: Piston corer (PC)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2Cholesterol per unit sediment massCholesterol/sedµg/gSchulte, SonjaGas chromatography - Mass spectrometry (GC-MS)
3Keto-ol, C30 per unit sediment massKeto-ol C30/sedµg/gSchulte, SonjaGas chromatography - Mass spectrometry (GC-MS)
Size:
244 data points

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